<!-- Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/ -->
<html>
  <head>
    <style>
      body { margin-top: 50px }
      .relpos_parent {
        position: relative;
        width: 100px;
        height: 100px;
        background: lightblue;
      }
      .abspos_child {
        position: absolute;
        left: 30px;
        bottom: 10px;
        width: 20px;
        height: 130px;
        background: purple;
      }
    </style>
  </head>
  <body>
    <div>
      <div class="relpos_parent">
        <div class="abspos_child"></div>
      </div>
    </div>
  </body>
</html>
